Place the chicken breasts skin side up in a greased shallow "stove to table" baking dish. Brush with melted butter. Bake in a preheated 375°F oven for 30 minutes. Meanwhile, melt 1/2 stick of butter. Combine the flour, sugar, salt, cinnamon and ginger in a small bowl, mix, and add to butter. Stirring constantly, add the orange juice. Cook slowly until thick and smooth. Pour over chicken and bake 40 minutes longer.